2．Children with autism （自闭症） have difficulty with social skills and communication．They often behave in limited and repeated ways and have what seem like unusual strong interests．
Autism is more common in boys than girls．What causes it is not clear．Scientists are studying genes and possible environmental influences．
Doctors usually cannot confirm a diagnosis of autism until a child is about three years old．Rebecca Landa is a researcher at the Kennedy Krieger Institute and Johns Hopkins University School of Medicine in Maryland．Professor Landa wanted to find out what differences in development might be seen earlier．She led a new study that observed 235babies between six and 36months of age．
"At six months of age，the signs of some risk for developing communication and social delays，including autism，include motor delays，like when you lay your baby on their back and you pull them by the arms gently into a seated position，the baby's head may nod back behind the shoulders，like poor head control．So that does not mean that the baby is going to have autism，but it does mean the baby needs to have some exercises to strengthen their body．And when they strengthen their body，they are better able to play with toys and engage with people，which then goes on to help them have better outcomes．"
By the time a baby is one year old，signs of possible autism include difficulty in using words and not looking eye-to-eye or reaching out to other people．By 14months，the baby might smile less and use language less．However，Professor Landa says these signs can be so small that they might be missed during a short health exam．
"It's important for parents to stay tuned in to their children's development，and if a parent is concerned about a child's development，for professionals to listen to them．"
The earlier parents notice delays，she says，the sooner they can begin doing simple things that may help improve their child's development，such as talking to the child about what they are doing，commenting when the child shows them something，and playing simple games that keep the child's attention．
51．What's the best title of the passageA？
A．Watching for Early Signs of Autism in Babies
B．How to Confirm a Diagnosis of Autism
C．Children with Autism Have Difficulty in Communication
D．Ways to Help Children with Autism to Recover
52．What can we learn from the third paragraphB？
A．Landa has found ways to confirm a diagnosis of autism when a baby is about six
months．
B．Landa tried to find out autism earlier by comparing the differences as the baby grows up．
C．Now doctors can confirm diagnosis of autism before a child is about three years old．
D．Doctors observed 235babies between six and 36months of age under the guide of Landa．
53．When a baby with signs of possible autism is a year and two months，he or she mayD．
A．show great interest in learning
B．have difficulty in raising his head
C．like reaching out to other people
D．hate to communicate with others
54．What should the parents do when their child is diagnosed with autismC？
A．Send the child to the hospital at once．
B．Find a special school for children with autism．
C．Spend more time talking with the child．
D．Encourage the child to play games online．
55．In which column could you find this passageB？
A．Education Report．
B．Health Report．
C．Economics Report．
D．Sports Report．
分析 本文属于科普说明文阅读，主要介绍了可能患有孤独症的儿童在不同的时期表现出的不同的表现．
解答 ABDCB
51．A 主旨大意题．根据文章三至六段内容可知本文主要叙述了不同年龄段的可能患有孤独症的孩子的不同的症状，并呼吁父母亲要及时注意到孩子的变化．故A正确．
52．B 细节理解题．根据第三段最后两句Professor Landa wanted to find out what differences in development might be seen earlier．She led a new study that observed 235 babies between six and 36 months of age．可知Landa教授通过观察6-36个月之间的孩子的情况来研究孤独症．故B正确．
53．D 细节理解题．根据第五段第二句By 14 months，the baby might smile less and use language less．可知患有孤独症的14个月的孩子笑得更少而且说话更少．也就是说他们不愿意和别人交流．故D项正确．
54．C 细节理解题．根据文章最后一段The earlier parents notice delays，she says，the sooner they can begin doing simple things that may help improve their child's development，such as talking to the child about what they are doing，commenting when the child shows them something，and playing simple games that keep the child's attention． 可知当孩子得自闭症的时候父母应该花更多的时间和孩子聊天．故选C．
55．B 推理判断题．本文属于科普说明文阅读，主要介绍了可能患有孤独症的儿童在不同的时期表现出的不同的表现．属于健康保健的内容，所以最可能出现在健康保健类的内容中．故B项正确．
点评 做阅读理解时要快速的浏览全文，把握文章主旨大意，带着问题回到原文，寻找细节或概括相应的答案，最后要理清作者写作思路．
